The GP6500 puts out 6,500 W continuously and up to 8,125 W for a few seconds when a motor starts. It runs up to 11.5 h at 50% load on a full 7.9 gal29.9 L tank. It weighs 172 lb78 kg. It takes 1.06 qt1 L of engine oil, and the source recommends 10W-30 or SAE 30. The spark plug is Bosch F7TC or equivalent, gap 0.028–0.031 in (0.70–0.80 mm).
Specifications
Units: /| Power | |
|---|---|
| Running output | 6,500 W 1 |
| Starting output | 8,125 W 1 |
| Voltage | 120/240 V 1 |
| Engine | |
| Engine | Generac OHV 1 |
| Displacement | 389 cc 1 |
| Fuel | Unleaded gasoline, 87 octane minimum 2 |
| Starting | Recoil (pull start) 1 |
| Fuel and run time | |
| Tank | 7.9 gal29.9 L 1 |
| Run time | 11.5 h 1at 50% load16.5 hours at 25% load. |
| Size and noise | |
| Weight | 172 lb78 kg 1Unit weight from the spec sheet; shipping weight is 190 lb. The owner's manual gives a dry weight of 174.8–186 lb for the GP6500 and GP6500E together. |
| Length × width × height | 27.2 × 27 × 26.5 in692 × 684 × 674 mm 1Length with the handle extended: 45.3 in (1,151 mm). |
| Outlets | |
| Outlets | 2 × 120 V 20 A GFCI duplex (5-20R) 1 × 120/240 V 30 A twist-lock (L14-30R) |
| Other | |
| CO shutdown | COsense 1 |
| Emissions certification | 49-state (7680) and 50-state (7683) versions 1 |
| Warranty | 3 years residential, 1 year commercial 1 |
Oil, spark plug and service
What to have on the bench before an oil change or tune-up.
| Oil capacity | 1.06 qt1 L 1 |
| Oil type | 10W-30 or SAE 30 1The owner's manual's temperature chart also lists synthetic 5W-30. |
| Spark plug | Bosch F7TC or equivalent, gap 0.028–0.031 in (0.70–0.80 mm) 2 |
| Change oil every | After the first 30 hours, then every 100 hours or every year 2The manual also says to change it every season, and every month under heavy load or in high temperatures. |
Parts
Search links for common parts. Check the part number against the label on your unit before you buy.
| Part | Find it |
|---|---|
| Air filter | Amazon · eBay |
| Spark plug | Amazon · eBay |
| Engine oil | Amazon · eBay |
We may earn a small commission if you buy through these links. It doesn't change what we list. More.
Model numbers
This page covers model numbers 7680, 7683, 76803, 76723. Brands often sell the same name under several numbers with small differences, so check the label on the frame.
Compare
Often compared: Generac GP5500E, Generac GP8000E, Westinghouse WGen7500
Questions people ask
How much oil does the Generac GP6500 take?
1.06 qt1 L. Oil type: 10W-30 or SAE 30. Oil change: After the first 30 hours, then every 100 hours or every year.
What spark plug does the Generac GP6500 use?
Bosch F7TC or equivalent, gap 0.028–0.031 in (0.70–0.80 mm), according to the source. Check the plug in your unit before you buy a replacement.
How long does the Generac GP6500 run on a tank?
11.5 h. That's at 50% load, according to the source. More load means less time.
How much does the Generac GP6500 weigh?
172 lb78 kg. Unit weight from the spec sheet; shipping weight is 190 lb. The owner's manual gives a dry weight of 174.8–186 lb for the GP6500 and GP6500E together.
What's the difference between 6,500 W and 8,125 W?
6,500 W is what it can supply continuously. 8,125 W is a short burst for the moment a motor (a fridge, a pump, an AC unit) starts up.
Sources
- Generac GP6500 spec sheet (models 7680 and 7683). Manufacturer, accessed November 11, 2026.
- Generac GP Series portable generator owner's manual. Owner's manual, accessed November 11, 2026.
- Generac GP6500 product page (model 76803). Manufacturer, accessed November 11, 2026.
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